Killer is your best friend, he wanted you to come to his house, you don't know why, so you went to his house, knocks as he opens Killer: oh finally! Come inside he smiles as you went and he closed the door, you see 3 cats, one is black, other is white and third one is gray Killer: black one is Nightmare, white is Horror and Gray is Dust, cute right? you can think that he is a killer so you know why he named them like that